JP2016073932A - Filter cloth inversion type belt press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt press in which side leak does not occur by folding one endless filter cloth thereby forming a filtration space.SOLUTION: A belt press 1 in which one endless filter cloth 3 is so wound around plural rollers 2 as to be capable of freely travelling is equipped with: a hopper 4 which supplies sludge onto the filter cloth 3 on an inner peripheral side of the endless filter cloth 3; a folding unit 6 which folds the filter cloth 3 from both lateral sides to a sludge supply side in a width direction of the filter cloth 3 and overlaps the folded filter cloths 3 thereby forming a filtration space 5; an inversion roller 34 which inverts the folded cloth 3 by 180 degrees; a shear roll 7 around which the folded filter cloth 3 is wound; and a development roller 8 for developing the folded filter cloth 3; and an inversion roller 35 which inverts the developed filter cloth 3 by 180 degrees. Thus, a belt press, in which side leak does not occur and which is downsized, can be provided.SELECTED DRAWING: Figure 1

Description

The present invention relates to a belt press that forms a filtration space by folding back an endless filter cloth that hangs around freely in the width direction.

Conventionally, a belt press that dewaters sludge sandwiched between two filter cloths by using two endless filter cloths by multiple rollers and dewatering them by the tension of the filter cloths and the pressing force of the pressure roller. It is used.
In addition, in Patent Document 1, a single endless filter cloth is held in a double fold shape perpendicular to the traveling direction of the filter cloth, and sludge is supplied to the double fold and dehydrated by a pressure roller. A belt press is disclosed.

Further, Patent Document 2 discloses a moromi frying tank method that squeezes moromi in a tri-fold filter cloth using an apparatus for squeezing moromi.
Similarly, Patent Document 3 discloses an apparatus that wraps and squeezes moromi with a trifolded filter cloth and folds the filter cloth into three folds.

JP 58-50197 A Japanese Examined Sho 46-28152 Japanese Patent Publication No. 46-22557

In the belt press using two conventional filter cloths, or in the dewatering part of the belt press disclosed in Patent Document 1, the moisture content of sludge is high or the supply amount is large. For example, part of the sludge escapes in the vertical and horizontal directions. Here, the longitudinal direction indicates the traveling direction of the filter cloth, and the lateral direction indicates a direction perpendicular to the traveling direction (width direction) on the filtration surface of the filter cloth.

In a conventional belt press using an endless filter cloth, two filter cloths are stacked one above the other, or one filter cloth is folded in two to form a filtration space between the filter cloths. When the filtration space is formed in this way, the filter cloth forming the filtration space is always torn and discontinuous at both ends or one end in the longitudinal direction of the filtration space deformed by external pressure. Therefore, the mating surface of the filter cloth is easily opened by the pressure from the inside.
Therefore, when pressure is applied from the outside during dehydration and sludge in the filtration space escapes in the lateral direction, there is a possibility that side leakage occurs and the sludge protrudes from the end of the filter cloth.
For these reasons, the belt press is often limited to the pressure of pressing, and is often inferior to other dehydrators in terms of moisture content of the dehydrated cake.

Moreover, although patent document 2 and patent document 3 disclose the technology of wrapping and squeezing moromi in a tri-fold filter cloth, the tri-fold filter cloth is further folded, stacked, and pressed. It is a device that does not squeeze continuously.

In a belt press in which an endless filter cloth is run around multiple rollers, the hopper that supplies sludge onto the filter cloth on the inner periphery of the endless filter cloth, and both sides in the width direction of the filter cloth Folding the filter cloth from the side to the sludge supply side, overlapping the folded filter cloth to form a filtration space, a reversing roller for inverting the folded filter cloth 180 degrees, a shearing roll for winding the folded filter cloth, and folding By providing a spreading roller that spreads the filter cloth and a reversing roller that reverses the spread filter cloth by 180 degrees, the apparatus is compact in order to supply sludge on the inner peripheral side of the filter cloth without causing side leaks. it can.

By forming both ends in the longitudinal direction of the filtration space with folded portions of the filter cloth, sludge does not leak out from both ends in the longitudinal direction of the filtration space, and dehydration can be performed by applying higher pressure.

By making the part of the filter cloth over 1/4 width from both sides in the width direction and having a width of 1/3 or less as a fold, the place where the filter cloth overlaps becomes the center of the filtration space, and the filtration space seal is strong It becomes.

The folding device includes a pressure roller that presses the filter cloth downward to form a U-shaped bottom portion, a guide roller that folds the filter cloth on both sides of the pressure roller to form both sides of the U-shape, and a U-shape. The filter cloth can be smoothly folded back by including a plurality of guide rods that bend inward the both side surfaces of the filter cloth that is bent inward.

Since both ends of the filtration space form the filtration space by folding the filter cloth, no side leak occurs. Since the filtration space is formed by overlapping the folded filter cloths to form a seal, the seals of the overlapped filter cloths become stronger by applying external pressure. Since side leakage does not occur, it becomes possible to increase the amount of sludge supplied and to dehydrate at a higher pressure.
Also, no special equipment is required to seal the filtration chamber. Furthermore, since dehydration is performed while running an endless filter cloth, dehydration can be performed continuously. Then, the stock solution is supplied from the inner peripheral side of the endless filter cloth, the front and back of the filter cloth are inverted by 180 degrees, and the dehydrated cake is discharged to the outer peripheral side of the filter cloth, thereby increasing the efficiency of the raw solution supply space and the filter cloth The travel path can be shortened and the belt press can be downsized.

1 is a schematic side view of a belt press according to the present invention. Similarly, it is the schematic of the filter cloth folded with the folding apparatus. Similarly, it is the schematic of a reversing roller. Similarly, it is the schematic of the folding device of a filter cloth. Similarly, it is a top view of the filter cloth wound around the developing roller.

The present invention is a belt press in which a filtration space is formed by folding a piece of endless filter cloth that is hung around freely and dewatering is performed by supplying sludge to the filtration space.
FIG. 1 is a schematic side view of a belt press according to the present invention.
The belt press 1 of the present invention includes a plurality of rollers 2, a single endless filter cloth 3 that can be run around the plurality of rollers 2, and an inner peripheral side of the endless filter cloth 3. A hopper 4 for supplying sludge to the filter cloth 3 and a folding device for folding the filter cloth 3 from both sides in the width direction of the filter cloth 3 to the sludge supply side and overlapping the folded filter cloths 3 to form a filtration space 5 6, a reversing roller 34 for reversing the front and back of the folded filter cloth 3 180 degrees, a shearing roll 7 around which the folded filter cloth 3 is wound, a developing roller 8 for unfolding the folded filter cloth 3, and the unfolded filter cloth 3 A reversing roller 35 that reverses the front and back by 180 degrees.

One endless filter cloth 3 wound around a plurality of rollers 2 is folded back at both ends in the width direction by a folding device 6. The folding device 6 supplies the sludge from the hopper 4 while folding both ends of the filter cloth 3 in the traveling direction (vertical direction) so that the endless filter cloth 3 receives the sludge. Therefore, in the process of folding, both ends of the filter cloth 3 are folded, and sludge is supplied onto the filter cloth 3 when the cross section of the filter cloth 3 becomes U-shaped. The filter cloth 3 is folded by the folding device 6, and the filter cloth 3 is overlapped to form a filtration space 5, and the supplied sludge is wrapped with the filter cloth 3. The filter cloth 3 that has supplied the sludge to the filtration space 5 is wound around the shear roll 7 to dehydrate the sludge. Before the sludge is supplied to the filtration space 5 and dehydrated, the folded filter cloth 3 is reversed 180 degrees by the reverse roller 34. After dehydration, the filter cloth 3 folded by the developing roller 8 is developed, and the dehydrated cake is discharged by a peeling device. After discharging the dehydrated cake, the front and back of the filter cloth 3 developed by the reversing roller 35 are reversed 180 degrees again and returned to the sludge supply side. By reversing the filter cloth 3 with the reverse roller 35 after discharging the dehydrated cake, the filtration surface of the filter cloth 3 reversed with the reverse roller 34 returns to the inner peripheral side (sludge supply side) of the filter cloth 3.

FIG. 2 is a schematic view of the filter cloth folded by the folding device according to the present invention.
The endless filter cloth 3 shown in FIG. 2 (a) has folding portions 9a and 9b that extend in the direction of travel of the filter cloth 3 and fold back to the sludge supply side from both ends in the width direction. . First, a 1/3 width portion (folding surface 10a) is folded inward at one folding portion 9a at the 1/3 width portion, and then 1 / at the other folding portion 9b at the 1/3 width portion. The three-width portion (folding surface 10b) is folded back inward. Accordingly, the filter cloth 3 is folded back so that the folding surfaces 10a and 10b are overlapped on the inner side to form a trifold, and the filtration space 5 is formed inside the trifold.

By folding back the filter cloth 3, both ends in the longitudinal direction of the filtration space 5 deformed by pressure are formed by the folded portions 9 a and 9 b of the filter cloth 3, so both ends of the filtration space 5 formed by the trifold filter cloth 3 are It is not torn and no side leak occurs.
Further, the folded surfaces 10 a and 10 b of the folded filter cloth 3 are overlapped to seal the filtration space 5. By applying pressure from the outside, the strength of the seal at the overlapping portions of the folding surfaces 10a and 10b is increased, so that sludge does not leak from the overlapping portions of the folding surfaces 10a and 10b.
In the embodiment of the present invention, the trifold filter cloth 3 is used, but the effects of the present invention can be obtained by other folding methods.

The endless filter cloth 3 shown in FIG. 2 (b) has folding portions 9a and 9b that fold back from the both sides in the width direction to the sludge supply side at a position slightly on the center side from the 1/4 width. First, the folding surface 10a is folded inward from the folding portion 9a slightly on the center side than the quarter width, and then the other folding surface 10b is folded on the inside from the folding portion 9b slightly on the center side than the quarter width. Since the folded portions 9a and 9b are folded back at a position slightly central from the both sides, the folded surfaces 10a and 10b overlap to form the filtration space 5 inside.

In addition, since the effect of this invention will be acquired if the both ends of the folded back filter cloth 3 overlap, one side is folded inward at a 1/4 width location, and the other is a location on the middle side slightly from the 1/4 width location. The effects of the present invention can also be obtained by folding inward. Therefore, at least one of the folded portions 9a and 9b may be set slightly on the center side from the quarter width portion. Moreover, it does not ask which of the cloth cloth both ends up and down in the overlapping part of the folding surfaces 10a and 10b.

Since the filter cloth 3 is folded back, both ends in the longitudinal direction of the filtration space 5 deformed by pressure are formed by the folded portions 9a and 9b of the filter cloth 3, and both ends of the filtration space 5 are not torn, Does not occur.
Further, the folded surfaces 10 a and 10 b of the folded filter cloth 3 are overlapped to seal the filtration space 5. By applying pressure from the outside, the strength of the seal at the overlapping portions of the folding surfaces 10a and 10b is increased, so that sludge does not leak from the overlapping portions of the folding surfaces 10a and 10b. Since the area where the folding surfaces 10a and 10b overlap is small compared to the tri-fold, the effective filtration area can be increased.

As described above, the endless filter cloth 3 can form the filtration space 5 by folding back both sides in the width direction from the both ends to more than 1/4 width and 1/3 width or less. .

Various forms of folding the filter cloth 3 of the present invention are conceivable. In any case, one endless filter cloth 3 is folded back to the sludge supply side at both ends in the width direction, and the folding surface 10a of the filter cloth 3 is folded. The filtration space 5 is formed by overlapping 10b. The endless filter cloth 3 prevents the occurrence of side leaks by forming both ends in the longitudinal direction of the filtration space 5 that is deformed by pressure from the outside by the folded portions 9 a and 9 b of the filter cloth 3. Then, the folded surfaces 10a and 10b of the endless filter cloth 3 that is folded back partially serve as a seal for the filtration space 5 by overlapping each other. In order to increase the sealing performance, the overlapping area of the filter cloth 3 folding surfaces 10a and 10b may be increased. Further, the sealing performance can be improved by further folding back the overlapping portions of the filter cloth 3 folding surfaces 10a and 10b.

≪Reversing roller≫
FIG. 3 is a schematic view of a reversing roller according to the present invention.
The reversing roller 34 for reversing the filter cloth 3 wrapped with sludge and the reversing roller 35 for reversing the developed filter cloth 3 according to the present invention are arranged at appropriate positions on the front and back of the filter cloth 3 to guide the reversal of the filter cloth 3. To do. As shown in FIG. 3 (a), a plurality of filter cloths 3 are arranged along the traveling direction across both sides of the filter cloth 3, and the filter cloth 3 is guided and held in an inclined state and a vertical state along the reversal of the filter cloth 3. The cloth 3 can be reversed.
In addition, as shown in FIG. 3 (b), the three reversing rollers 34 and 35 are disposed obliquely with respect to the filter cloth 3, and can be reversed 180 degrees by winding them alternately on the front and back of the filter cloth 3, respectively. Can be made. The first reversing roller 34 a is slid on one surface of the filter cloth 3, arranged obliquely with respect to the traveling direction of the filter cloth 3, and the filter cloth 3 is wound around. The wound filter cloth 3 is inverted 30 to 60 degrees. The second reversing roller 34b is slid on the other surface of the filter cloth 3, and is disposed obliquely like the first reversing roller 34a, and the filter cloth 3 is wound around. The wound filter cloth 3 is inverted by 60 to 120 degrees. A third reversing roller 34c is slid on one surface of the filter cloth 3, and is disposed obliquely in the same manner as the other reversing rollers 34a and 34b, and the filter cloth 3 is wound around. The wound filter cloth 3 is reversed by 90 to 180 degrees and reversed by 180 degrees through the three reversing rollers 34c.
Moreover, if the filter cloth 3 is reversed 90 degrees or more with the 3rd reversing roller 34c, the filter cloth 3 will be reversed naturally only by winding on the roller 2 of a back | latter stage in a reversed state.
Thus, the reversing rollers 34 and 35 may be arranged in any way as long as the front and back of the filter cloth 3 are reversed 180 degrees.

The filter cloth 3 folding device 6 of the present invention bends the traveling filter cloth 3 by arranging a plurality of guides. In this embodiment, a folding device 6 that folds the filter cloth 3 in three is used.

As shown in FIG. 1, the belt press 1 of the present invention has a hopper 4 disposed so as to supply sludge to the inner peripheral side of an endless filter cloth 3 wound around a plurality of rollers 2. In the present embodiment, sludge is supplied from the hopper 4 to the filter cloth 3 that runs under the belt press 1. The filter cloth 3 fed with the sludge and turned back by the folding device 6 is turned upside down by the reversing roller 34 by 180 degrees, and runs upward while being wound around the shear roll 7. After the dewatering is performed by the shear roll 7, the filter cloth 3 is wound around the developing roller 8 above the hopper and developed, and the dehydrated cake is discharged. After discharging the dewatered cake, the front and back of the filter cloth are reversed 180 degrees by the reversing roller 35 and returned to the sludge supply unit.

FIG. 4 is a schematic view of a filter cloth folding apparatus according to the present invention.
The folding device 6 of the present invention includes a pressure roller 11 and a guide roller 12 that bend the filter cloth 3 into a U shape, and guide bars 13a and 13b that guide the filter cloth 3 horizontally. Moreover, the hopper 4 is arrange | positioned in the position which can supply sludge in the filter cloth 3 bend | folded in the U shape on the inner peripheral side of the endless filter cloth 3. FIG.

The filter cloth 3 folded by the folding device 6 is formed in a U shape by the pressing roller 11 so that sludge does not leak out. The width of the pressing roller 11 is equal to the folded width of the filter cloth 3, and the filter cloth 3 is formed in a U shape by pressing the center portion of the upper surface of the filter cloth 3 downward with the pressing roller 11. Accordingly, the pressing roller 11 forms a U-shaped bottom. At the same time, both ends of the filter cloth 3 are bent by the guide rollers 12 arranged perpendicular to both side surfaces of the pressing roller 11 to form U-shaped side surfaces. On the downstream side of the pressing roller 11, a hopper 4 for supplying sludge is suspended toward the traveling filter cloth 3, and the sludge is continuously supplied.

The filter cloth 3 whose both side surfaces are vertical along the guide roller 12 is bent inward by a plurality of horizontally fixed guide bars 13a and 13b on the downstream side from the position where the hopper 4 is disposed. One vertical end of the filter cloth 3 is guided to be bent horizontally at the bottom of the guide bar 13a, and the other vertical end of the filter cloth 3 is similarly bent horizontally at the bottom of the guide bar 13b. I will guide you. Since both sides of the vertical filter cloth 3 are folded inward and become horizontal, the filter cloth 3 folds while traveling and wraps sludge inside.
When the auxiliary bar 14 is horizontally disposed at the bottom of the filter cloth 3 in contact with the guide bars 13a and 13b, the filter cloth 3 is not bent by the pressing of the guide bars 13a and 13b, and the filter cloth 3 is folded in three. Misalignment does not occur. The guide rod 13 and the auxiliary rod 14 are rod-shaped, plate-shaped, or the like.

The folding device 6 described above can cope with various ways of folding the filter cloth 3 by appropriately arranging a plurality of guides as well as the three folding of the filter cloth 3.

As shown in FIG. 1, the filter cloth 3 wrapped with sludge by the folding device 6 is wound around a shear roll 7 to dehydrate sludge. In addition, the filter cloth 3 folded by the folding device 6 is inverted 180 degrees by the reverse roller 34. The shear roll 7 is wound around the filter cloth 3 to apply surface pressure to the sludge in the filtration space 5 and further shears due to the difference in travel speed between the filter cloth 3 traveling inside and the filter cloth 3 traveling outside. Apply power to dehydrate. Dehydration is possible not only by the shear roll 7 but also by applying a high pressure from the outside with a pressure belt or a pressure roll. Since the filter cloth 3 is folded in three to prevent side leaks, no side leak is generated even when the pressure is increased.

FIG. 5 is a plan view of a filter cloth wound around a developing roller according to the present invention.
The filter cloth 3 wound around the plurality of shear rolls 7 is developed into three folded by the developing roller 8, and the dewatered cake is discharged by the peeling device. The filter cloth 3 that has been folded in three is unfolded, wound around the spreading roller 8, and traveled, so that the filter cloth 3 that has been folded in three is naturally spread between the shear roll 7 and the spreading roller 8.
After the filter cloth 3 is folded back by the folding device 6, the filter cloth 3 is inverted, so that when it is unfolded, a dehydrated cake is formed on the outer peripheral side of the endless filter cloth 3. The dehydrated cake on the outer peripheral side of the filter cloth 3 can be easily discharged to the outside simply by winding the filter cloth 3 around a roller. Further, if the reversal of the filter cloth 3 is on the upstream side of the developing roller 8, the dewatered cake can be discharged on the outer peripheral side of the filter cloth 3.
Since the dewatered cake dehydrated at high pressure has good peelability, the dewatered cake can be easily peeled by wrapping the filter cloth 3 around a peeling roller provided as a peeling device. In this embodiment, the developing roller 8 is used as a peeling roller.

After discharging the dewatered cake, as shown in FIG. 1, the front and back of the filter cloth 3 are reversed 180 degrees by the reversing roller 35 and returned to the sludge supply side. Therefore, the filtration surface of the filter cloth 3 is always the inner peripheral side (sludge supply side) of the filter cloth 3 in the sludge supply unit.

Since the belt press of the present invention forms a filtration space by folding an endless filter cloth, side leak does not occur. Moreover, a belt press can be reduced in size by supplying sludge and folding the filter cloth on the inner peripheral side of the endless filter cloth.

DESCRIPTION OF SYMBOLS 1 Belt press 2 Roller 3 Filter cloth 5 Filtration space 6 Folding device 8 Unfolding roller 9a, 9b Folding part 11 Press roller 12 Guide roller 13a, 13b Guide rod 34, 35 Reverse roller

Claims (4)

In a belt press (1) in which a single endless filter cloth (3) is run around a plurality of rollers (2 ...).
A hopper (4) for supplying sludge onto the filter cloth (3) on the inner peripheral side of the endless filter cloth (3);
A folding device (6) that folds the filter cloth (3) from both sides in the width direction of the filter cloth (3) to the sludge supply side and overlaps the folded filter cloth (3) to form a filtration space (5);
A reversing roller (34) for reversing the folded filter cloth (3) by 180 degrees;
A shear roll (7) around which the folded filter cloth (3) is wound;
A developing roller (8) for unfolding the folded filter cloth (3);
A reversing roller (35) for reversing the developed filter cloth (3) by 180 degrees;
A filter cloth reversing belt press characterized by comprising: The filter cloth reversible belt press according to claim 1, wherein both ends of the filtration space (5) in the longitudinal direction are formed by folding portions (9a, 9b) of the filter cloth (3). 3. The filter cloth according to claim 2, wherein the filter cloth (3) has a folded portion (9 a, 9 b) at a portion that exceeds ¼ width and is １ ／ width or less from both sides in the width direction. Reversing belt press. The folding device (6)
A pressure roller (11) that presses the filter cloth (3) downward to form a U-shaped bottom,
A guide roller (12) that bends both sides of the filter cloth (3) on both sides of the pressure roller (11) to form both sides of the U-shape;
4. A plurality of guide bars (13 a, 13 b) that bend inward both side surfaces of the filter cloth (3) that is bent into a U-shape. 5. Filter cloth reversing belt press.

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